There are various applications you can use to create a GeoJSON file based on an area of interest (AOI).
This example uses geojson.io, a free web-based tool used for generating GeoJSON files.
Instructions
1. Launch geojson.io from http://geojson.io/#map=2/20.0/0.0
2. Navigate to your area of interest (AOI).
3. Click on the type of shape you wish to draw in the toolbar. Select line, rectangle, polygon, or point, but in most instances polygon gives you the most control.
4. Using a polygon in this instance, draw an AOI by clicking desired points on the map to outline the AOI. Once you complete the polygon it will be shaded and the associated JSON will be generated in the output area to the left.
5. To save the AOI as a GeoJSON file, click on Save from the menu bar and select GeoJSON.
You have now created a GeoJSON file that you can import into other applications such as Planet Explorer.
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